build: update dependencies to latest (root + examples)

Bumps eslint, vitest, tsdown, pg, prettier, zod, @swc/core, acorn,
typescript-eslint, @types/* etc. to latest. Two deps deliberately held:
- typescript stays 6.x: typescript-eslint (latest 8.64) peer-requires
  typescript <6.1, so the linter can't move to TS7 yet. Typechecking is
  already on TS7 via @typescript/native-preview (tsgo), which coexists as a
  separate package precisely for this reason.
- @typescript/native-preview pinned exactly (was a caret on a daily -dev
  prerelease, which npm resolves UP across 7.0.0-dev.* — a drift footgun).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: ryanrasti